Anthesis of rice

Published online May

PublicationsOutputs and results Variation in time of day of anthesis in rice in different climatic environments Thermal stress and in particular heat during anthesis causes sterility in rice inflorescences. Rice spikelets open in the morning and close a few hours later.

Genotypic variation in the time of day of anthesis is considered an escape mechanism from thermal stress, but little is known on its dependency on environmental conditions.

One traditional, cold-tolerant rice cultivar and three improved tropical rice cultivars were grown in four different climatic environments under flooded conditions to study the environmental response of time of day of anthesis.

The environments were the cold-dry season and the hot-dry season in Senegal, the temperate summer in Southern France and the dry season in the Philippines. The time of day when the first spikelets opened, a maximum of spikelets were open and the last spikelets closed was observed daily on a population basis 2 m2 plots replicated 3 times.

The time of these observations was expressed as hours after sunrise hasr calculated from astronomic day length and the local time of solar noon. Aggregate flowering periods were 4 10 d at panicle scale and 14 32 d at population scale.

Within a day, onset of anthesis was earliest in the Philippines 3. The duration from onset to end of anthesis varied between 1. Genotypic differences in time of anthesis and duration of anthesis were small. Low Tmin thereby delayed and low VPD advanced anthesis processes.

Under the assumption that panicle temperature during anthesis is indeed a major determinant of spikelet fertility in rice, it is concluded that the sensitivity of time of day of anthesis to air temperature and humidity is an effective eco-physiological adaptation of the rice crop.

Prospects for improved modeling approaches for the prediction of thermal sterility in rice are discussed.Crop Science Abstract - CROP BREEDING & GENETICS Genetic Analysis of Heat Tolerance at Anthesis in Rice. RESEARCH PAPER Post-anthesis development of inferior and superior spikelets in rice in relation to abscisic acid and ethylene Jianchang Yang1, Jianhua Zhang2,*, Zhiqing Wang1, Kai Liu1 and Peng.

Request PDF on ResearchGate | Inheritance of tolerance to high temperature at anthesis in rice | The problem of high temperature in rice in the tropics is exacerbated by climate change. Anthesis. Crop Science Abstract - CROP BREEDING & GENETICS Genetic Analysis of Heat Tolerance at Anthesis in Rice Mapping quantitative trait loci for heat tolerance at anthesis in rice using chromosomal segment substitution lines Breeding Science Rice .

Anthesis. Anthesis is the most sensitive stage of rice to high temperatures (Yoshida et al., ) and the heat-sensitive processes of anthesis are anther dehiscence, pollination, pollen germination, and to a lesser extent pollen tube growth, which is completed within 45min of the opening of a rice spikelet (Ekanayake et al., ).